WO2009096804A1 - Oil filter for downhole motor - Google Patents
Oil filter for downhole motor Download PDFInfo
- Publication number
- WO2009096804A1 WO2009096804A1 PCT/RU2008/000050 RU2008000050W WO2009096804A1 WO 2009096804 A1 WO2009096804 A1 WO 2009096804A1 RU 2008000050 W RU2008000050 W RU 2008000050W WO 2009096804 A1 WO2009096804 A1 WO 2009096804A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- motor
- oil
- oil filter
- drive shaft
- Prior art date
Links
- 239000003921 oil Substances 0.000 claims abstract description 38
- 239000002594 sorbent Substances 0.000 claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 239000010705 motor oil Substances 0.000 claims abstract description 6
- 239000011236 particulate material Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 10
- 230000001012 protector Effects 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 229910052570 clay Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002087 whitening effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000011109 contamination Methods 0.000 description 5
- 150000007513 acids Chemical class 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/20—Filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
Definitions
- This invention relates to oil filters for use in electric motors for downhole tools.
- the invention relates to oil filters for use in the motors of electric submersible pumps of the type used in oil wells.
- FIG 1 shows an ESP of the type to which the present invention relates.
- Such pumps are typically used in oil wells to provide artificial lift where there is insufficient reservoir pressure to produce oil to surface.
- the pump comprises a motor section 10 including an electric motor, a protector section 12 above the motor which provides an inlet for well fluids, and a pump section 14 including a multi stage pump.
- a drive shaft (not shown) extends from the motor section through the protector to the pump. Electric power is provided from the surface by means of a cable (not shown).
- the motor section comprises an oil-filled housing in which a rotor mounted in the drive shaft and a stator is located.
- the oil acts to lubricate the moving parts of the motor and to provide electrical insulation between the electrical components.
- the oil becomes contaminated due to the build-up of particulate materials arising from physical wear and erosion of the parts of the motor.
- Filters are provided in the motor housing to filter the particulates from the oil and maintain its lubricating properties.
- One aspect of the invention provides an oil filter for use in an electric motor forming part of a downhole device, comprising a two-part filter including a first part formed from a porous material which acts to filter solid particulate material from the motor oil, and a second part comprising a sorbent for removing aqueous liquids from the motor oil.
- the filter comprises a body defining a central bore through which a drive shaft of the motor can extend.
- the body can comprise multiple filter blocks joined together to define the central bore.
- the body comprises a chamber formed from a porous material defining the first part of the filter, the sorbent being contained within the chamber.
- a chamber formed from a porous material defining the first part of the filter, the sorbent being contained within the chamber.
- One preferred form of chamber comprises a U-shaped section with an angled cover.
- the porous material forming the U-shaped section can have a smaller pore size that that forming the angled cover.
- the porous material comprises porous metal.
- the sorbent can comprise silica gel, activated carbon, whitening clay, zeolite, alumina oxide or mixtures thereof.
- a second aspect of the invention provides a motor for a downhole device comprising a motor housing containing a stator fixed to the housing, a rotor mounted on a drive shaft in the housing, and an oil filter according to the first aspect of the invention mounted in the housing and preferably around the drive shaft.
- the motor comprises multiple filters in the housing, for example oil filters can be mounted above both above and below the rotor and stator.
- the motor can further comprise a washer located around the drive shaft above the oil filter that extends radially outwardly from the drive shaft so that flow is directed through the filter rather than between the drive shaft and the filter.
- a third aspect of the invention provides an ESP comprising a motor according to the second aspect of the invention, wherein the drive shaft is connected to a shaft in a pump section.
- the motor is typically positioned below the pump section.
- a protector section can be positioned between the motor and the pump section.
- the upper filter can be located in the protector section.
- Figure 1 shows a schematic view of an ESP
- Figure 2 shows a cross section through a filter according to a first embodiment of the invention
- Figure 3 shows a cross section through a second embodiment of the invention
- Figure 4 shows a modification of the embodiment of Figure 3
- Figures 5 and 6 show a third embodiment of the invention
- Figure 7 shows a further embodiment of the filter according to the invention.
- the only filtering system was a metal filter with relatively large pores for removing particulates.
- This filter is placed in the bottom of the motor section. While such a filter solves the problem of oil contamination by particulates, it is totally ineffective with respect to water contaminations and acidising. Since water often enters the motor from the above (from the protector section), even the placement of such a filter is not correct.
- the filter can be placed below the phase seal between the protector and motor section through which the motor drive shaft passes. Such placement, ensures that water leakage can be successfully captured by this system before it enters the motor itself and causes problems.
- This invention is based on the use of two mechanisms: filtering and absorption.
- Filtering can typically be achieved with the help of any porous filter such as metal filter, ceramic filter etc.
- the part responsible for absorption typically comprises a silica gel (however, for different systems, other sorbents such as zeolite, activated carbon etc. can be also used).
- sorbents such as zeolite, activated carbon etc. can be also used.
- the choice of a sorbent depends on exploitation conditions and type of typical contaminations.
- the filter according to the invention includes two parts: porous filter used to remove mechanical conductive particulates (metal filter, ceramic filter etc.) and a sorbent used to remove water and acids (silica gel etc).
- the filter may be constructed in various ways, for example:
- the sorbent can be placed inside a porous chamber (such as metal, ceramics etc.) ensuring that it can stand high external pressures.
- a porous chamber such as metal, ceramics etc.
- Each sorbent particle can be covered by porous material and the particles placed afterwards in a wise mesh structure (e.g. a metal net). Further examples will be discussed below.
- a wise mesh structure e.g. a metal net
- FIG. 2 shows one embodiment of a possible filter structure comprising a housing 20 formed from a hollow steel cylinder that is provided with a cover 22.
- a porous cylinder 24 provides a central bore around which porous top and bottom discs 26, 28 are provided such that the housing 20, cylinder 24 and discs 26, 28 form a toroidal chamber in which silica gel sorbent 30 is located.
- the inside diameter d1 of the cylinder 24 is slightly large than the outside diameter of the motor shaft (not shown) so that the filter can be positioned around the shaft.
- One modification to this approach can be the addition of small blades attached to the shaft that enhance the flow of oil through this filter in radial direction when the shaft is rotating.
- the filter can be installed as integrated system (e.g. as a part of the ESP protector), as a bypass system connected to the main electric system (motor) using tubing, direct coupling etc.
- the volume of sorbent can be 10% of the total oil volume, for example.
- the filter housing includes two sections: one immovable 32, attached to the pump housing 34 ; and one rotating part 36 attached to the drive shaft 38. both sections are formed from porous metal and contain silica gel sorbent 40.
- the construction of the two sections is such that a flow channel is formed between the two sections has with a profile that ensures that fluid always passes across the filter even when the motor is stopped.
- Figure 4 shows a modification of the embodiment of Figure 3 in which the filter is placed above a thrust bearing 42 ensuring the backflow of oil across the filter as indicated by the arrows 44.
- a small flow channel can be provided between the filter outer wall and pump housing.
- Such a filter may be installed below the lower rotary seal at the bottom of the motor etc.
- the filter body is formed in two parts comprising a U-shaped channel section 50 and a circular angled cover 52 that fits on the section 50 to define the filter chamber 54.
- the section 50 and cover 52 are formed from porous metal and silica gel sorbent fills the chamber 54.
- the filter body is attached to the motor housing 56 and a sleeve 58 is provided around the motor shaft 60 where it passes through the bore in the middle of the filter body. The sleeve 60 allows parts of the pump above and below the filter to be held in compression on the shaft 60.
- the porous metal forming the U-shaped section 50 can have a smaller pore size than that forming the angled cover 52.
- filtering of particulates can be optimised by arranging the cover 52 to trap the larger particulates while allowing smaller particulates into the chamber 54 where they are filtered by the smaller pores of the U-shaped section 50.
- Filtering by the angled cover 52 can also be optimised by adjusting the relative axial heights h of the inner and outer arms of the U-shaped section 50 so as to provide an angled cover 52 of an appropriate surface area.
- a downwardly-angled washer 62 is mounted around the shaft 60 above the filter body, the outer periphery 64 of the washer 62 extending well over the angled cover 52.
- oil in the motor housing will circulate through the filter body, the section 50 and cover 52 acting to remove particulates and the silica gel absorbing water and aqueous liquids. Particulates and liquid droplets that fall down into the housing from above (e.g. from the pump section or the protector section) are defected by the washer so as to fall on the cover and be filtered rather than pass between the filter and the shaft.
- multiple filters are placed in the housing, for example one such filter can be positioned at the top of the motor (or in the bottom of the protector section) and another at the bottom of the motor section.
- the filter itself can be made from multiple filter blocks joined together to define the central bore.
- Figure 7 shows one such example in which four filter blocks 70a- 7Od are arranged to define a central bore 72 though which the shaft can extend. Other, similar arrangements with different numbers of block can also be used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtration Of Liquid (AREA)
- Motor Or Generator Frames (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2712820A CA2712820C (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
BRPI0821614-2A BRPI0821614A2 (en) | 2008-01-31 | 2008-01-31 | Oil filter for use in an electric motor formed from a device inside a well, motor for a device inside a well, characterized in that it comprises a motor housing containing a stator |
PCT/RU2008/000050 WO2009096804A1 (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
GB1014275.0A GB2469429B (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
US12/864,688 US20110097223A1 (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
NO20101056A NO20101056L (en) | 2008-01-31 | 2010-07-23 | Well engine oil filter |
EC2010010377A ECSP10010377A (en) | 2008-01-31 | 2010-07-30 | ENGINE OIL FILTER LOCATED IN THE FUND OF A WELL |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU2008/000050 WO2009096804A1 (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009096804A1 true WO2009096804A1 (en) | 2009-08-06 |
Family
ID=40913002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/RU2008/000050 WO2009096804A1 (en) | 2008-01-31 | 2008-01-31 | Oil filter for downhole motor |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110097223A1 (en) |
BR (1) | BRPI0821614A2 (en) |
CA (1) | CA2712820C (en) |
EC (1) | ECSP10010377A (en) |
GB (1) | GB2469429B (en) |
NO (1) | NO20101056L (en) |
WO (1) | WO2009096804A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102146914A (en) * | 2011-05-03 | 2011-08-10 | 蒋洪涛 | Rotary type magnetic vibration stoppage-prevention filter |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10633961B2 (en) * | 2013-04-16 | 2020-04-28 | Framo Engineering As | Oil filtration system for subsea oil-filled machines |
US20150064034A1 (en) * | 2013-08-27 | 2015-03-05 | Summit Esp, Llc | Modular intake filter system, apparatus and method |
US10677032B1 (en) | 2016-10-25 | 2020-06-09 | Halliburton Energy Services, Inc. | Electric submersible pump intake system, apparatus, and method |
JP2020197139A (en) * | 2019-05-31 | 2020-12-10 | 三菱重工業株式会社 | Pump for oil field |
US11976660B2 (en) | 2019-09-10 | 2024-05-07 | Baker Hughes Oilfield Operations Llc | Inverted closed bellows with lubricated guide ring support |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1255268A (en) * | 1968-04-02 | 1971-12-01 | Atomic Energy Commission | Filtration method of separating liquids from extraneous materials |
SU436415A1 (en) * | 1971-03-18 | 1974-07-15 | С. Помазкова , А. А. Богданов Особое конструкторское бюро бесштанговым насосам | SUBMERSHIP OIL FILLED MOTOR |
RU2050920C1 (en) * | 1992-10-16 | 1995-12-27 | Юрий Васильевич Тахистов | Adsorption apparatus |
RU2171826C1 (en) * | 2000-08-09 | 2001-08-10 | ООО "Мембрана" | Method for isolation of organosulfur compounds from petroleum and petroleum products |
RU2229327C2 (en) * | 2001-12-24 | 2004-05-27 | Открытое акционерное общество Ангарская нефтехимическая компания | Method of dehydration of light oil products and device for its realization |
US6981853B2 (en) * | 2001-06-18 | 2006-01-03 | Schlumberger Technology Corporation | Protector for electrical submersible pumps |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2048679A (en) * | 1929-12-27 | 1936-07-28 | Auto Research Corp | Lubricating installation |
US1989349A (en) * | 1932-07-18 | 1935-01-29 | Submersible Motor Pump Co Ltd | Seal for rotating shafts |
US2295097A (en) * | 1939-04-05 | 1942-09-08 | Tokheim Oil Tank & Pump Co | Apparatus for removing water from oil-circulating systems of internal combustion engines |
US3327866A (en) * | 1964-06-15 | 1967-06-27 | Pall Corp | Woven wire mesh |
-
2008
- 2008-01-31 WO PCT/RU2008/000050 patent/WO2009096804A1/en active Application Filing
- 2008-01-31 CA CA2712820A patent/CA2712820C/en not_active Expired - Fee Related
- 2008-01-31 US US12/864,688 patent/US20110097223A1/en not_active Abandoned
- 2008-01-31 GB GB1014275.0A patent/GB2469429B/en not_active Expired - Fee Related
- 2008-01-31 BR BRPI0821614-2A patent/BRPI0821614A2/en not_active IP Right Cessation
-
2010
- 2010-07-23 NO NO20101056A patent/NO20101056L/en not_active Application Discontinuation
- 2010-07-30 EC EC2010010377A patent/ECSP10010377A/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1255268A (en) * | 1968-04-02 | 1971-12-01 | Atomic Energy Commission | Filtration method of separating liquids from extraneous materials |
SU436415A1 (en) * | 1971-03-18 | 1974-07-15 | С. Помазкова , А. А. Богданов Особое конструкторское бюро бесштанговым насосам | SUBMERSHIP OIL FILLED MOTOR |
RU2050920C1 (en) * | 1992-10-16 | 1995-12-27 | Юрий Васильевич Тахистов | Adsorption apparatus |
RU2171826C1 (en) * | 2000-08-09 | 2001-08-10 | ООО "Мембрана" | Method for isolation of organosulfur compounds from petroleum and petroleum products |
US6981853B2 (en) * | 2001-06-18 | 2006-01-03 | Schlumberger Technology Corporation | Protector for electrical submersible pumps |
RU2229327C2 (en) * | 2001-12-24 | 2004-05-27 | Открытое акционерное общество Ангарская нефтехимическая компания | Method of dehydration of light oil products and device for its realization |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102146914A (en) * | 2011-05-03 | 2011-08-10 | 蒋洪涛 | Rotary type magnetic vibration stoppage-prevention filter |
Also Published As
Publication number | Publication date |
---|---|
GB2469429A (en) | 2010-10-13 |
ECSP10010377A (en) | 2010-08-31 |
CA2712820C (en) | 2015-11-24 |
GB2469429B (en) | 2012-09-26 |
CA2712820A1 (en) | 2009-08-06 |
US20110097223A1 (en) | 2011-04-28 |
NO20101056L (en) | 2010-08-27 |
GB201014275D0 (en) | 2010-10-13 |
BRPI0821614A2 (en) | 2015-06-16 |
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